Metallic radiator thermometer



R. b HEBROCK. METALLIC RADlATOR THERMOMUER.

APPLICATION FILED AUG-22. I921.

Patented June 20, 1922.

UNITED STATES RICHARD G. HEBROCK, OF IRVINGTON, NEW JERSEY.

METALLIC RADIATOR THERMOMETER.

Application filed August 22, 1921.

To all whom it irmy concern:

Be it known that I. RICHARD (l. IiIGBROCK, a citizen of the United States, residing at Irvington. in the county of. Essex and State ol New Jersey have invented certain new and useful Improvements in Metallic Radiator Thermometers, of which the following is a specification.

My invention relates to thermometers for automobile radiators.

The object of the invention is to provide a simple and effective metallic thermometer adapted to be secured in the radiator cap and comprising a coiled sprin of thermostatic material secured at one enc to the upper end of a hollow plug extending from the dial casing down through the casing nipple.

A further object of the invention is to provide a double pointer secured at its base to the heat responsive device and working at opposite sides of a two face dial so that the position of the ointer will be clearly visible from the drivers position as well as at the front of the machine.

A further, object of the invention is to provide a thermostatic spring of novel con struction especially adapted for this type of thermometer.

I attain these objects bythe mechanism shown in the accompanying drawing in Which Fig. l is a perspective view of my improved radiator thermometer from the rear.

Fig. 2 is a sectional front elevation thereof.

Fig. 3 shows the spring, double pointer and the tubular attaching device removed.

Fig. 4 shows the blank from which the spring is formed.

Fig. 5 shows the blank from the which double pointer is formed.

Fig. 6 is a cntral vertical transverse sec tion on. line 6-6 Fig. 2.

The circular casing 1 of the thermometer has a central annular internal flange 2 and 3. depending hollow threaded attaching nipple 3 adapted to be secured to a radiator cap 28 by means of the nuts 2627 which clamp the cap against a shoulder 4 formed on the casing 1 at the upper end of the nipple 3.

The dial 5, preferably formed of two separate plates 6, is graduated from 0 to 30!). on both of its faces.

Secured Within the bore of the nipple 3 and extending at its upper end into the bottom of casing l is a spring-carrying tubular Specification of Letters Patent.

Patented June 20, 1922.

Serial No. 494,288.

support 7, which closely fits the upper reduced end of the bore of the nipple and has a transverse partition 8 near its upper end to prevent the entrance of water or steam into the casing l. The lower portion of the tubular support 7 is spaced away from the bore of the nipple so that the steam may have free access to the exterior of said support. This tubular support T is cut away at its upper closed end to form a shoulder 9 to which soldered or otherwise secured one end of a coiled thermostatic spring 10 formed of any-of the usual materials used in this class of springs. The base or attaching end 11. of the spring 10 is provided with a slot 12 to afford two points of attachment to the shoulder 9 and to increase the strength of the spring. This slot 12 also permits the spring to have its coils passed through the slot so that they willpall lie in the same plane with the free end 13, projecting at the proper angle to receive the base of the double pointer 14, which pointer also lies in the same plane with the sprin; instead of to one side thereof.

The spring 10 is formed from a flat blank as shown in Fig. 4.

The double pointer 14, is also formed from a single blank having two parallel lingers 15 connected at their inner ends by a base or cross piece 16 which cross piece forms the point of attachment to the spring.

The two members of the pointer 14' xtend at opposite sides of the dial 5 and the dial is cut away at its lower edges as at 11) to accommodate the spring ill and allow of the free working. The double pointer l4 is renderedluminous in any approved manner so that the same may be readily observed at night. The casing 1. is closed by means of glass discs 17, 17, held in place by the outer rings l8-18, and the screws 19. suitable washers 20 being placed at the inner sides of the rings. The screws 19 after passing through the rings 18 and the washers 20 enter threaded apertures on the annular flange.

The operation will be readily understood by those familiar with coil spring thermo static thermometers in which the unequal expansion of the metal causes the spring to bend and so move the pointer along the dial.

What .1 claim is l. A metallic radiator thermometer conr prising a casing provided with a tubular de pending attaching nipple, and having a two faced raduated dial, a thermostatic spring thereof with its two members respectively secure at one end in the casing and proat opposite sides of the dial. vided at its free end with a double pointer 6. A metallic radiator thermometer com secured t the base to the free end f th prising a casing having a double fare dial spring with its two members respectively exn l SGd between its front and rear glazed tending over opposite faces of the di l, faces, the lower edge of the dial having an 2. A metallic radiator the m t mopening therethrough, a tubular attaching prising a casing provided with a tub l d nipple depending from the lower edge of the pending attachin nipple, and having a two casing, a spring supporting means closing faced graduated ial,asupport closin comthe upper end of the attaching nipple, a

munication between the c sin a d t tcoiled thermostatic spring secured at one te hi i l a thermostatlg Spring end to said supporting means within the dial cured at one end to the up e d f id opening and a double pointer secured to the support and a double point r o n t d t free end of the spring with the two members its base to the free end of the sprin with it respectively extending along opposite faces two arms respectively extendingat opposite 0f he d a sides of the dial, 7. Athermostatic thermometer comprising 3. A metallic radiator th rmom t o a casing provided with a central depending prising a casing provided with a tubul d tubular attaching nipple, a dial within the pending attaching nipple and a t o f d casing, a tubular support closing the upper dial, a tubular support fitted in th said ni end of the tubular attaching nipple and exple and closed at its upper end, a the m tending down into said nipple in spaced static spring secured at one end to the upper relation therewith, a coiled thermostatic closed end of said support and a do bl spring secured at one end to-the upper closed pointer secured to the free end of said spring end of the support and a pointer extending with its two arms respectively extending from the outer free end of the said spring. along opposite sides of the dial. 8. A thermostatic thermometer compris- 4. In a metallic thermpmeter,' a coiled ing a casing glazed on both sides and having thermostatic spring having a slotted attach an intermediate two faced dial and a central ing end; the coils of the spring extending depending tubular attaching ni iple, having through said slot and lying in the same plane closing means at its upper end, a thermoand a pointer projecting from the free end static spring secured at one end in the casof the spring. ing at the {upper closed end of the nipple 5. In a metallic thermometer, a two faced and adoublepointer secured to the upper dial, a coiled thermostatic spring having a free end of the spring in the plane thereof slotted attaching end; the coils of the spring with its two members extending along the op extending through said slot and lying in the posite faces of the dial. same plane and a double pointer projecting In testimony whereof I aflix my signature. from the free end of the spring in the plane RICHARD G. HEBROCK. 

